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Whois-RWS Released 17 July 2010

Posted: Monday, 19 July 2010

ARIN is pleased to announce the release of Whois-RWS.

ARIN’s Whois RESTful Web Service (Whois-RWS) is the directory service for accessing registration data contained within ARIN’s registration database. Whois-RWS provides several improvements over ARIN’s previous Whois service. Whois-RWS can easily be integrated into command line scripts similar to Whois or RWhois, or it can be accessed with a web browser.

For those who rely on existing scripts and clients, ARIN will continue to maintain services for the NICNAME/WHOIS protocol on TCP/43. This is achieved by using a proxy service to translate traditional ARIN Whois queries into Whois-RWS queries.

View service differences, a Whois-RWS FAQ, and API documentation at:

Important details on other features in development can be found at:

Please send any questions, comments, or issues to:


Mark Kosters
Chief Technology Officer
American Registry for Internet Numbers (ARIN)

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